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  • 1
    Electronic Resource
    Electronic Resource
    Increase of xylitol yield by feeding xylose and glucose in Candida tropicalis (1998)
    Springer
    Applied microbiology and biotechnology 50 (1998), S. 419-425 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Candida tropicalis, a strain isolated from the sludge of a factory manufacturing xylose, produced a high xylitol concentration of 131 g/l from 150 g/l xylose at 45 h in a flask. Above 150 g/l xylose, however, volumetric xylitol production rates decreased because of a lag period in cell growth. In fed-batch culture, the volumetric production rate and xylitol yield from xylose varied substantially with the controlled xylose concentration and were maximum at a controlled xylose concentration of 60 g/l. To increase the xylitol yield from xylose, feeding experiments using different ratios of xylose and glucose were carried out in a fermentor. The maximum xylitol yield from 300 g/l xylose was 91% at a glucose/xylose feeding ratio of 15%, while the maximum volumetric production rate of xylitol was 3.98 g l−1 h−1 at a glucose/xylose feeding ratio of 20%. Xylitol production was found to decrease markedly as its concentration rose above 250 g/l. In order to accumulate xylitol to 250 g/l, 270 g/l xylose was added in total, at a glucose/xylose feeding ratio of 15%. Under these conditions, a final xylitol production of 251 g/l, which corresponded to a yield of 93%, was obtained from 270 g/l xylose in 55 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051314
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  • 2
    Electronic Resource
    Electronic Resource
    Optimization of erythritol production by Candida magnoliae in fed-batch culture (2000)
    Springer
    Journal of industrial microbiology and biotechnology 25 (2000), S. 100-103 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: Candida magnoliae; erythritol; fed-batch culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A two-stage fed-batch process was designed to enhance erythritol productivity by the mutant strain of Candida magnoliae. The first stage (or growth stage) was performed in the fed-batch mode where the growth medium was fed when the pH of the culture broth dropped below 4.5. The second stage (or production stage) was started with addition of glucose powder into the culture broth when the cell mass reached about 75 g dry cell weight l−1. When the initial glucose concentration was adjusted to 400 g l−1 in the production stage, 2.8 g l−1 h−1 of overall erythritol productivity and 41% of erythritol conversion yield were achieved, which represented a fivefold increase in erythritol productivity compared with the simple batch fermentation process. A high glucose concentration in the production phase resulted in formation of organic acids including citrate and butyrate. An increase in dissolved oxygen level caused formation of gluconic acid instead of citric acid. Journal of Industrial Microbiology & Biotechnology (2000) 25, 100–103.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.7000039
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of distribution coefficients on the separation factor of lithium isotopes (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 107 (1986), S. 17-27 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The influence of distribution coefficients on the separation factor of lithium isotopes was studied with Dowex 50W-X8, 200–400 mesh, ammonium form, strongly acidic cation exchanger by changing the pH and EDTA concentration of the eluent. It was found that the larger the EDTA concentration in the buffer solution, the smaller the distribution coefficients were. The separation factor was increased with decreasing EDTA concentration. The separation factor of lithium isotopes linearly increased up to a distribution coefficient value of 30, and gradually increased above 30. The optimum value of distribution coefficient of lithium to separate litihium isotopes was about 30. The distribution coefficient was increased with increasing pH, but the separation factor of lithium isotopes has no relation with pH.6Li concentrated on the resin phase, and7Li in the solution phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02333258
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  • 4
    Electronic Resource
    Electronic Resource
    Phenobarbital specific antisera and radioimmunoassay (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 820-821 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé On a développé un anticorps d'une grande affinité et spécifité envers le phénobarbital en inoculant des lapins avec une solution de barbiturateprotéide, synthétisée d'acide barbiturique de 5-phényl-5-(4-aminobutyl) et d'albumine de sérum bovin par du carbodiimide. Usant de cet anticorps comme radioimmunoeassai, on peut mesurer jusqu'à 1 picomole de phénobarbital par ml de fluides biologique sans que d'autres barbiturates y opposent une réaction significative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946308
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of soybean oil and glucose on sophorose lipid fermentation by Torulopsis bombicola in continuous culture (1997)
    Springer
    Applied microbiology and biotechnology 48 (1997), S. 23-26 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The effect of soybean oil and glucose on the growth of Torulopsis bombicola and sophorose lipid production in continuous culture was investigated. As the dilution rate in 100 g/l glucose and 100 g/l soybean oil medium was increased, the dry cell weight and sophorose lipid concentration decreased. Sophorose lipid productivity, however, was maximum at a dilution rate of 0.03 h−1. The cell yield from glucose and the sophorose lipid production from soybean oil were approximately constant regardless of the dilution rate. The specific consumption rate of soybean oil was closely related to the specific production rate of sophorose lipid. These results suggest that soybean oil was used only for sophorose lipid production whereas glucose was used only for cell mass and maintenance. When the soybean oil concentration was varied at fixed dilution rate in 100 g/l glucose medium, a high concentration of soybean oil was found to inhibit sophorose lipid production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051009
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  • 6
    Electronic Resource
    Electronic Resource
    Cyclic ureas as solvents for poly(aryl ether) synthesis (1993)
    Springer
    Polymer bulletin 30 (1993), S. 25-31 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The synthesis of various poly(aryl ethers) and related small molecule compounds were examined using the cyclic urea 1,3-Dimethyl-3,4,5,6-tetrahydro-2(IH)-pyrimidinone (N,N′-dimethylpropylene urea, DMPU) as the solvent. The results showed that generally higher molecular weight or yields were obtained under less stringent conditions, as compared to other common polymerization solvents. The enhancement was most notable for polymerizations involving aryl fluorides with a lower reactivity than conventionally activated dihalide monomers, e.g. ketones, sulfones. Poly(aryl ethers) displayed excellent solubility in DMPU, which was beneficial in the cases where more rigid heterocyclic-aryl ether polymers are formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296230
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  • 7
    Electronic Resource
    Electronic Resource
    Computer simulation of three-dimensional stellar systems in cylindrical coordinates (1992)
    Springer
    Astrophysics and space science 193 (1992), S. 217-234 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheN-body problem does not have an exact and analytic solution, and computer technique or computer simulation can be a good candidate to solve it. Computing speed in computer simulation is very important. There are many algorithms and computational methods in computer simulation which reduce computer time. In this report a computer simulation model in a cylindrical coordinate, in which the FACR (Fourier Analysis and Cyclic Reduction) method is used, has been proposed and demonstrated the presence of spiral, barred, and ringed galaxy. The method using a cylindrical grid has good symmetrical properties specially for rotating stellar systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643202
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  • 8
    Electronic Resource
    Electronic Resource
    Effective Thermal Conductivity and Permeability of Aluminum Foam Materials1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 453-464 
    Details
    ISSN: 1572-9567
    Keywords: aluminum foam metal ; effective thermal conductivity ; friction factor ; permeability ; pressure loss
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An experimental measurement program was performed to determine thermophysical properties of aluminum-based foam metals. The effective thermal conductivity k e and permeability K were investigated in detail. Experimental facilities were fabricated, and the measurement procedures and methodologies were evaluated. One-dimensional heat conduction was considered to determine k e . The results indicate that k e increases as the porosity ε decreases. However, no noticeable changes in k e were detected from variations of the cell size of the foam metal at a fixed porosity ε. The permeability K is substantially affected by both ε and the cell size. An empirical correlation for the friction factor f is proposed based on the concepts of K and inertial effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006643815323
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  • 9
    Electronic Resource
    Electronic Resource
    Dielectric spectra of fresh cement paste below freezing point using an insulated electrode (1994)
    Springer
    Journal of materials science 29 (1994), S. 1910-1914 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The spectra of complex dielectric constant were measured on a fresh cement paste with a water/cement ratio of 0.4 sandwiched between insulated electrodes in the frequency range 10 kHz–1 MHz and temperature range between 0 °C and — 30 °C. The bulk dielectric constant, 30–20, and conductivity, 6.14×10−5−0.65×10−5, in the temperature range −10 to −28 °C were much lower than those at room temperature, owing to the great decrease of ionic mobility caused by freezing the cement paste. The activation energy of 0.31 eV for the ionic conduction in fresh cement paste was obtained from an Arrhenius plot of conductivity at subzero temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351312
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  • 10
    Electronic Resource
    Electronic Resource
    Electrical properties of cement paste obtained from impedance spectroscopy (1995)
    Springer
    Journal of materials science 30 (1995), S. 3768-3772 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The impedance spectra of hydrating Portland cement paste showed a small part of a large depressed arc and a single depressed arc at low- and high-frequency regions, respectively. A new equivalent circuit was proposed for hydrating cement paste, which consists of a serial combination of a resistor and a constant phase element (CPE) with a resistor in parallel for the bulk effects, and a parallel combination of a resistor and a CPE for the electrode effects. The microstructural evolution in hydrating cement paste was associated with the changes in the resistances, capacitance and the critical relaxation time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153933
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